Theodor qviller



T. OVILLER. SAND AND'SPLINT CATCHER FOR WOOD PULP PLANTS AND THE LIKE.

APPLICATION FILED on. 31. 1918.

1,306,436. Patented June 10, 1919.

THEODOR QVILLER, or LIIQLESTROMMEN, NEAR CHRISTIANIA, NORWAY.

' sum AND srm'm: CATCHER FOR woon-rULr PLANTS AND THE LIKE.

To all whom itmay concern:

Be it known that I, Trmonon QVILLER, a subject of the King of Norway, of Lillestrommen, near Christiania, Norway, have invented certain new and useful Improveing drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The present invention has for its object to provide an automatical sand and splint catcher for wood ulp plants and the like.

The known sand catchers usually comprise long and comparatively shallow channels with transverse grooves-or bafiles extending across the whole breadth of the catcher from the bottom of the same up to somewhere below the level of the ulp. The purpose of said cross ribs or ba es is to make splints and other particles, which are heavier than the good fibers, sink and settle in the spaces between'the ribs. If the pulp comprises a large amount of splints and unboiled parts the spaces between ther'ibs are soon filled, whereupon impurities, .splints, etc., follow the pulp current, and the effect of the catcher is automatically stopped. I

For thisv reason sand catchers of this type very often have to-be put out of, action in order to be cleaned which gives a lot of work and at the same time makes itnecessary to use a double set of catchers in orderto keep the plant working continually during' the cleaning process.

It is obvious that catchers of this kind take up a large floor space and so necessitate extensive buildings.

The improved sand catcher accordin to the present invention is intended to avoi the above mentioned disadvantages being adapt- "ed to automatically remove the impurities settling in the same, so that it may be kept in continued operation making the use of reserve catchers unnecessary.

On the drawing Figure 1 is a plan view of the sand catcher. Fig.1 2 is. a same and vertical section through the Specification of Letters Patent. Pateiitd June 10, 1919, Application filed October '31, 1918. Serial no. 260,519.

Fig. 3 is a vertical section on the line IIIIII of Fig. 2 seen in the direction of to some distance above the floor of vessel serves to guide the pulp current along the cylindrical wall of vessel A until it is conducted into the form of a spiral toward the center of vessel A where a rotating sieve drum D is mounted. The pulp fibers together with the water in which they are swimming will pass through the perforated sieve drum D and out through one end of the sieve drum into channel E, which serves to conduct the pulp to the sorting machine.

As it will be seen on the drawingthe end of the sieve drum which serves as outlet for the pulp is provided with a collar or flange projecting against a corresponding collar or flange F mounted on the outlet channel E.

During its passage in the flat bottomed vessel A from channel C to sieve drum D the pulp will be sorted as the heavier parts settle on the bottom of the vessel. Scrapers G mounted on rotating arms H carry the impurities with them along the bottom of the vessel dropping them finally into the radial channel I in the bottom of the vessel said channel I being provided with a conveyer screw J. It is an important point that the scrapers G rotate with a velocity correspondthat no turbulent currents are created.

The coarser particles which follow the settling tank N on the bottom of which the coarser and heavier particles come to rest, while all the finer fibers carried with the impurities are separated from the latter by means of a slow current of water goingin an upward direction through settlin and flowing to ther with the fine bers over d settling tank into an annular the edge of sai tank L I ,vnel in the bottom of said vessel, means for,

- said impurities out of the vessel.

channel P fromwhich they are conducted. through an inclined channel Q back to th catcher vessel A. v

The impuritiessettlin in tankL at suitable intervals are remove by means of valve R. Said valve R may also be provided with an automatical controlling mechanism' for opening and closing the same at certain intervals.

Claims:

" -1. A sand or splint catcher for wood pulp plants'and the like, comprising a cylindrical fiat bottomed vessel, means for conducting the pulp tangentially into said vessel thereby moving the pulp current alon -the cylindrical wall of the vessel, a radial c hanconveying impurities settling on the bottom. of the vessel into said radial channel, and means in said radial channel forconveying I 2; Asand or splint catcher for wood pulp plants and the-like, comprising a cylindricalflat bottomed vessel, means for conduc ing the pulp tangentiallycinto said vessel, a spiral partition in the. latter. extending down to some distance above the bottom of a -ti t v the samefor guiding the pulp current alon the cylindrical .wall of the vessel, a radia channel on the bottom of said vessel, means I Y provided with scrapers near .the bottom ofthe vessel for conveying impurities settlin on'the bottom of "the vessel into said radia channel, and means in said 'radialchannel for conveying said impurities out of the vessel.

.. 4, A sand or splint catcher for wood p lp p'lantsand the like, comprislng a cylindrical fiat bottomed vessel, means for conducting the pulp tangentially into said vessel, a spiral partition in said vessel. extending down to some distance above the bottom of the same for guiding and moving the pulp" 'cnrrent along the cylindrical wall of the vessel, a'radial channel in the bottom of said vessel, and a rotating spider provided with scrapers below said spiral partition for conveying impurities settling on the bottom of the vessel into said radial channel, and means in said radial channel for conveying said impurities out of the vessel.

5; A sandor'splint 'catcherfor wood pulp plants and the like, comprisin a cylindrical flat bottomed vessel,.means or conducting the pulp tangentially into. said vessel and moving the pulp current along the cylindrical wall of the vessel, a radial channel in v the bottom of said vessel, 'means for con- I veying impurities settling on'the bottom of the vessel into said radial channel, an auxil-.

iary settling tank, means for conveying the particles settlin in said radial-channel into said settling tan and means for conducting. the finer particles carried with the impuritiesback from said settling tank into; the catcher.

-6. A sand or splint catcher. for wood pulp plants and the like, comprising a cylindrical iflat bottomed vessel, means for conducting the pulp tangentially into said vessel, a'

spiral partition in said vessel extending down to some distance above the bottom of the same for guiding the pulp current along the cylindrical wall of said vessel, a rotating sieve drum inclosed by said spiral wall for sorting out the fine particles, means for conveying impurities settling on the bottom of the vessel into said radlal channel, andmeans in said radial channel for conveying saidimpurities out of the vessel.

In testimony that I claim th as my invention, I have signed my name in presence of two subscribing witnesses.

THEODOR QVILLER. Witnesses: I

C. FAnRIoIUs HANSEN, EINAR W. Dresnmn foregoing f 

